<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<style>
  .father::before{
    content: '老鼠';
    color: green;
    width: 100px;
    height: 100px;
    background-color: blue;
  }
  .father::after {
    content: '大米';
  }
</style>
<body>

<div class="father">爱</div>


</body>
</html>
